Following up with that, it seems that the failure is due to a change in the kernel.

I'm testing 2 Kali netinst ISOs, one from last week (no problem), and a daily iso from today (which fails).

Last weekly iso had kernel 6.1.0-kali9-amd64. In this iso, `cat /proc/filesystems | grep efi` gives nothing, hence the grub-installer postinst doesn't try to mount the efivarfs.

Today's iso has kernel 6.3.0-kali1-amd64. In this iso, `cat /proc/filesystems | grep efi` gives `nodev efivarfs`, hence the grub-installer postinst tries to mount efivarfs, and fails.

Arnaud Rebillout / OffSec / Kali Linux Developer

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